Analysis of the Concentration Polarization of Technological Solutions in the Process of Their Nanofiltrational Separation.

Autor: Lazarev, S. I., Shestakov, K. V., Kotenev, S. I., Ignatov, N. N.
Předmět:
Zdroj: Journal of Engineering Physics & Thermophysics; Jul2023, Vol. 96 Issue 4, p1045-1051, 7p
Abstrakt: A method of determining the nonstationary concentration polarization of a solution, flowing in a plane channel, in the process of nanofiltration of the solution flow is proposed. The concentration polarization of the aqueous solutions, containing 0.5 kg/m3 of ZnSO4 and SnSO4, in the process of their nanofiltrational separation was analyzed. It was established that an increase in the transmembrane pressure in a separation apparatus in the range Pm = 0.5–2.0 MPa causes the coefficient of concentration polarization of the ZnSO4 and SnSO4 solutions in this apparatus to increase in the ranges θ = 1.340–1.436 and θ = 1.351–1.430, respectively. A calculation of the time of work of a membrane in a stationary regime and the volume of the permeate obtained in it has shown that, before a membrane is regenerated, the nanofiltrational separation of ZnSO4 and SnSO4 from their solutions at a definite pressure can be conducted for the times tm = 2070–2791 s and tm = 2893–2036 s, respectively. An increase in the transmembrane pressure causes these times to decrease and the amounts of the permeates obtained for the stationary-regime time to increase from 0.200 to 0.266 dm3 and from 0.202 to 0.262 dm3, respectively [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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